Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dc62307dba6882…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 19:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eee41d1854634851378609ca5db8afe9 SHA-1: 5043d8882fc20491d2adb51b1677c8ab540f948a SHA-256: e9dc62307dba6882ecb613351dfc5082987c6e46ba2c6c76ecd943ae2b9dabab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick the user into downloading a file. While no scripts were directly extracted, the nature of the link farm and the ML classifier's high confidence indicate a malicious intent to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i3m509j0063rqlrpfa3aqofpim/joduforunanakiburobepegup.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3d0554340bbc066b2a092e05eb437b10/kukudijerumomojikokovi.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/d2775bae1d5a300a26c6f8bef3b01b8b/3647795961.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a5d1b9f---fuwefupu.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/605u34gt88cqkpql3vfm853kj0/jamumemufejupupiwaju.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706b28480fa---rixufi.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qkdr3ll2flm5nd527ofm4ujgm4/jujisa.pdf
    • https://gaziemirkentkonseyi.com/upload/files/virixoxugowodeg.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3qoben8emilapiv3up1t51aca4/nokolokugepulubuzabuburox.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbce7ce0b7---61131572397.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f4927d63834cb1f9950ad53366d123bb/xawimumivazezerej.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817991251ea---totivokojavex.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9d1ec53c---norufudewol.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/1t19k579mdbm1ecpqru9o38pu4/52712577066.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160816200782b1---54933030786.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d15d9348---65535797680.pdf
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/xiletosulukujapatebamegus.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/h94utttfq2mik9baq6qgof0ce4/6296887103.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdbc405ca0---rolojifaveti.pdf
    • http://hzbmsj.net/images/upload/File/dolajex.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bf0585ec621cffcd13ef78b79b1f8b16/1497012825.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cdb8645b---43160320013.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb26bae934---dagefalexedijoz.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7b63f44adb899f9ce345e177d670a172/83053341394.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdfchm+net+account
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66e.bin
8c1ca263e0543d1970efa8883f2f47d59503c43b9a5c31736c79d05109fce2f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 17940 bytes
font_01_sfnt_off0001256c.bin
07573c8d4b552727306ff0d2ee0bb03cb9a9b7e28854f4042544444b2d3706dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1256C 10436 bytes
font_02_sfnt_off00013cf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 16792 bytes